Commit Graph

2 Commits

Author SHA1 Message Date
Sean Fertile 8efc2f5723 [PowerPC][AIX] Spill/restore the callee-saved condition register bits.
Extends the existing support for spilling and restoring the condition
register to the linkage area for 32-bit targets, and enables for AIX.

Differential Revision: https://reviews.llvm.org/D74349
2020-02-24 11:24:46 -05:00
Sean Fertile 88073d40c7 [PowerPC] Create a FixedStack object for CR save in linkage area.
hasReservedSpillSlot returns a dummy frame index of '0' on PPC64 for the
non-volatile condition registers, which leads to the CalleSavedInfo
either referencing an unrelated stack object, or an invalid object if
there are no stack objects. The latter case causes the mir-printer to
crash due to assertions that checks if the frame index referenced by a
CalleeSavedInfo is valid.

To fix the problem create an immutable FixedStack object at the correct offset
in the linkage area of the previous stack frame (ie SP + positive offset).

Differential Revision: https://reviews.llvm.org/D73709
2020-02-07 13:33:44 -05:00